BO 4.0 Error on document link

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Hello

I'm using BO 4 SP 2 Patch 10.

I'm trying to use the link document functionality within Webi.

In report 1 you will filter down to the customer this must be passed to report 2.

In report 2 the customer is set as a single BW bex variable.

I specify the customer field as a prompt in document link [Sold-to] and as a key field [Sold-to].

The url looks like this:

="<a href=\"../../opendoc/openDocument.jsp?iDocID=ASIlm_MtOO9IlsAWzaA2P_U&sIDType=CUID&sType=wid&sRefresh=Y&lsSZBOE_CUST="+URLEncode(""+[Sold-to party (0SOLD_TO)])+"&lsIZBOE_CUST="+URLEncode(""+[Sold-to party (0SOLD_TO)])+"\" title=\"\" target=\"_blank\" nav=\"doc\">"+[Sold-to party (0SOLD_TO)]+"</a>"

On clicking the hyper link this gives the error message WIS 00013.

While trying to invoke the method java.util.List.size() of object loaded from local variable 'values'

If I set the prompt to "user prompt at runtime" on clicking the hyperlink it will then prompt you to specify the customer.

Is this a bug that needs to be fixed? or is there another way to pass the variables using document prompts?

Graham